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Telomere or longevity effects would require years to assess, which is why researchers rely on biomarker proxies

Yes, when sold strictly as a research reference material for laboratory and in vitro use

The time it takes for vitamin B12 (cobalamin) treatment to produce noticeable effects varies considerably depending on the severity of deficiency, the route of administration, and individual patient factors

Kornev and Taylor, Reference Kornev and Taylor2015)
